Improvement in door-bells



Ffmklounsou.

d Door-Bell. No. 163,015. I Patented ma mms.

THE GRAPHIC C0.PHOTO-L ITH.39 8:41 PARK PLAOE,N.Y-

UNITED STATES PATENT Qrrron.

FRANK M. JOHNSON, OF BRISTOL, CONNECTICUT.

IMPROVEMENT lN DOOR-BELLS.

Specification forming part of Letters Patent No. 163,015, dated May 11,1875; application filed November 3, 1874;

To all whom it may concern: Be it knownthat I, FRANK M. J OHNSON, ofBristol, in the county of Hartford and State of Connecticut, haveinvented certain new and useful Improvements in Door-Bells, of which thefollowing is a specification:

In the accompanying drawing, Figure l is a front elevation of themechanism for a doorbell, which embodies my invention.

A designates the base-plate, provided with a central stud, B, whichforms the support for the bell. In order to better show the parts thebell, which may be of any ordinary form,

is not/shown. Upon the front of the base plateAis a star-wheel, C,hungso that it may be rotated upon a stud or screw, to, which stands atright angles to the face of the plate A. 1) designates the hammer,pivoted to the plate A by a pin or screw, I). Said hammer is providedwith an arm, 0, which extends toward the star-wheel C, so as to engagetherewith. The plateA is also provided with a spring, E, having twoarms, d f. One arm, d,engages with a pin on the hammer-arm c, and thearm f with the star-wheel C. If desired, two separate springs may beemployed instead of the one spring with two arms. The spring which bearsupon the star-wheel need not be so stiff as the other. I prefer, whenonly one spring is employed, to flatten the arm f, thereby making itthinner and less powerful. In the plate A is a vertical slot, g, withinwhich the end of a lever, G, moves up and down, said lever being hung toa plate upon the outside of the door, and operated by a handle whichextends through the door. Such levers being common, it is deemedunnecessary to describe them, and any mechanism that will raise andlower the piece G within the slot 9 may be substituted for said lever.

The star-wheel C I prefer to construct with five points; but it willwork well with a greater number, and may be made to work with less. Thiswheel is so pivoted on the plate that its points project over the slot9, and should be so shaped and located that when the lever G is raisedto its full height the notch between any two of the points will nearlycoincide with one end and side of the slot g, for a short dis tance fromone of its corners, as denoted by broken lines in the drawing.

By depressing the outer end of the lever the inner end G is raised, andengages with one point of the star-wheel C, and partially rotates it,when the point above the one directly operated upon by said leverengages with the arm 0 of the hammer D and raises it, the parts Cr C D cand E df being then thrown into the position indicated by broken linesin Fig. 1. Upon a farther but slight movement of the parts the arm 0disengages from the point of the star-wheel, when the hammer returns toits former position and strikes the inside of the bell. A spring (notshown) returns the lever G, and so soon, upon its return as it passesthe star-wheel the arm f of the spring E, bearing against one point ofsaid wheel, as denoted by broken lines, propels it farther forward, sothat another point is projected over the slot 9, ready for a repetitionof the opera tion hereinbefore described.

I claim as my invention- The star-wheel secured to the base-plate A, incombination with suitable springs, lever G,

and hammer c D, all substantially as described,

and for the purpose set forth.

FRANK M. JOHNSON.

Witnesses:

J AMEs SHEPARD, GEO. A. Gownv.

